"All of our beers are vegan friendly, with just three exceptions: our Local 2 Belgian-style ale, our recent (no longer distributed) Brewmaster's Reserve called Buzz Bomb, and our current Brewmaster's Reserve called The Concoction, all of which contain honey. Although our website states that our cask conditioned beers use isinglass, this is no longer true. A vegan substitute, Biofine Clear, is currently used to filter our cask beers. Here's some more info in case it's helpful:

None of our beers contain traces of milk, or corn. However, there is some residual sugar: glucose, maltose, and maltotriose. These sugars are derived from malted barley. We do not add sulfites as a preservative to our beer. Any sulfur formation is a result of the fermentation. Therefore, all of our beers are low in sulfites. Brooklyn Lager would be a good example of low sulfites, which has less than 1 ppm (the average sulfite content for wine is 80 ppm). Typically, sulfur dioxide levels in our beer are less than 1 ppm. The exceptions are Winter Ale, Black Chocolate Stout, Black Ops and Monster Ale, which have levels of 5-7 ppm of sulfur dioxide."

Company email:
"Lucky for you, we do not use isinglass in our filtering process, so none of our kegged or bottled beers have any animal products in them. A word to the wise though, if you happen to stop at a restaurant or our Brewery when we have casked beer, those do use isinglass so be sure not to have that (a cask is naturally carbonated beer that is aged. it looks like a smaller rounder keg turned on it's side with tap on one end)."

Company email:
"The only beers we produce that contain any animal products are our cask-conditioned ales (on the handpump or direct from the cask), which contain isinglass. We produce very little of this beer and you would be aware if it was being served to you. The other 99.99% of our beer contains no animal products and is suitable for vegans."

Additional email:
"All of our beers are vegan (that includes
bottles and kegs) with the exception of our cask beers. We do not use
any animal derivatives or sugars, and our filters are rice filters."